op {
  name: "IsVariableInitialized"
  input_arg {
    name: "ref"
    type_attr: "dtype"
    is_ref: true
  }
  output_arg {
    name: "is_initialized"
    type: DT_BOOL
  }
  attr {
    name: "dtype"
    type: "type"
  }
  allows_uninitialized_input: true
}
